"She's definitely not pregnant, thank God," the bride-to-be's stepdad told E! News at the grand opening of Lagasse Stadium at the Palazzo in Las Vegas Friday night.
"The reason's she's getting married is first, they want to, and second, Lamar starts camp next week and Khloé has a million things going on. If they're gonna do it, they want to do it now," Jenner said.
The Keeping Up With the Kardashians star also revealed that he will walk Khloé down the aisle Sunday.
When asked whether or not it would be difficult to give his stepdaughter away, the former Olympic athlete said, "Khloé's been with me since she was like five years old…it's never easy."
Check out the video for the full interview.